Helius (Helius) flavus ( Walker, 1856 )

Podenas, Sigitas, Podeniene, Virginija, Seo, Hong-Yul, Kim, A-Young, Park, Sun-Jae, Byun, Hye-Woo, Kim, Heung-Chul & Aukštikalnienė, Rasa, 2017, Limoniinae crane flies (Diptera: Limoniidae) new to Korea II, Journal of Species Research 6 (3), pp. 258-279 : 272-274

Helius (Helius) flavus ( Walker, 1856)

Rhamphidia flava Walker, 1856: 309 .

Helius flavus Savchenko, 1983: 65 ; 1986: 209-210.

Species previously not recorded from the Korean Peninsula.

General: Body coloration yellow to brownish yellow. Male body length 7.5-9.6 mm.

Head: Dark gray with dark brown median line, covered with dark brown setae. Eyes narrowly separated dorsally and ventrally. Antenna 1.5 times as long as rostrum. Scape elongate, cylindrical, dark brown. Pedicel yellow or brownish yellow, slightly shorter than scape. Flagellum dark brown. Basal flagellomeres oval, getting elongate and narrow towards apex. Longest verticils nearly twice as long as respective segments. Rostrum 0.95 mm long, dark brown dorsally, brown ventrally. Palpus dark brown.

Thorax: Cervical sclerites brown. Pronotum brownish yellow with brown median stripe. Mesonotal prescutum brownish yellow with brown spot fronto-medially. Scutal lobes brownish yellow to yellow, area separating scutal lobes pale. Scutellum and mediotergite yellow. Pleuron uniformly yellow to brownish yellow.

Wing ( Fig. 5A ): 7.2-8.1 mm long with grayish tinge, base and costal area yellowish. Stigma light brown, indistinct. Area along cubital vein and wing apex slightly darkened, brownish. Venation: Sc ending before branching point of Rs. Rs medium-long and nearly straight, just slightly arched at base. R 2 missing. R 3 and R 4+ 5 widely diverging. Cross-vein r-m short or totally missing. Discal cell wide at base, getting narrower distally, twice as long as wide. Free end of M 1+ 2 2.4 times as long as its basal part, that makes frontal margin of discal cell. Basal deflection of CuA 1 distinctly beyond branching point of M. Second anal vein slightly sinuous. Anal lobe medium-sized, comparatively narrow. Halter yellowish, length of male halter 1.1-1.4 mm.

Legs: Coxae yellow, trochanters brownish yellow. Femur and tibia brownish yellow with slightly darkened apex. Tarsus brown basally, turning dark brown distally. Male femur I: 6.5-8.5 mm long, II: 7.1-8.1 mm, tibiae I: 8.75 mm, II: 7.8-8.9 mm.

Abdomen: Abdominal tergites brownish yellow, sternites 1-6 yellow, seventh sternite brown, eighth yellow with brown spot at middle. Male terminalia ( Fig. 5B ) yellow. Ninth tergite transverse, with wide median emargination of posterior margin.

Genitalia: Gonocoxite elongate, with large setose ventro-mesal lobe. Interbase long, slightly curved with long subapical setae. Outer gonostylus bidentate and blackened at apex. Inner gonostylus with long narrow apical lobe, that is situated at right angle to gonostylus itself. Postero-lateral margin of gonostylus with five teeth, distal-most tooth could be reduced. Usually inner gonostyles on both sides aren’t exactly symmetrical. Penis narrow, rod-shaped and arched at middle, reaching slightly beyond base of ventro-mesal lobe of gonocoxite. Ninth sternite simple, posterior margin rounded.

Elevation range in Korea: All specimens were collect- ed at 30-40 m.

Period of activity in Korea: End of June through July. Same period of activity was observed in South Primorye, Far East of Russia ( Savchenko, 1983).

Bionomics: Wet areas covered by deciduous trees, shrubs or grasses, muddy river, pond or lake margins. In South Korea it was found in only two localities near the demilitarized zone, and likely extends into North Korea.

Distribution: Species is widely distributed in Europe. In Asia it was known only from South Primorye, Far East of Russia ( Savchenko, 1983).

Examined material: 1♂ (in EtOH, wing slide-mount- ed), S. Korea, Gyeonggi-do, Paju-si, Jinseo-myeon, Eoryong-ri , Neutral Nations Supervisory Commission Camp, N 37°57 ʹ 16.80 ʺ, E 126°40 ʹ 47.92 ʺ, alt. 32 m, 2015. 06.23, T . A. Klein, H.C. Kim, Mosquito Magnet ( NIBR); 2♂♂ (in EtOH), S. Korea, Gyeonggi-do, Paju-si, Gunnae-myeon, Jeomwon-ri , South-MDL, N 37°56 ʹ 3.53 ʺ, E 126°43 ʹ 15.46 ʺ, alt. 39 m, 2015.07.03, T . A. Klein, H.C. Kim, Mosquito Magnet ( NIBR); 3♂♂ (in EtOH), S. Korea, Gyeonggi-do, Paju-si, Jinseo-myeon, Eoryong-ri , Neutral Nations Supervisory Commission Camp , N 37°57 ʹ 16.80 ʺ, E 126°40 ʹ 47.92 ʺ, alt. 32 m, 2015.07.10, T . A. Klein, H.C. Kim, Mosquito Magnet ( NIBR); 1♂ (in EtOH), S. Korea, Gyeonggi-do, Paju-si, Jinseo-myeon, Eoryong-ri , Neutral Nations Supervisory Commission Camp , N 37°57 ʹ 16.80 ʺ, E 126°40 ʹ 47.92 ʺ, alt. 32 m, 2015.07.24, T . A. Klein, H.C. Kim, Mosquito Magnet ( NIBR) .

Figures

Fig. 5. Helius (Helius) flavus. A. wing. B. male genitalia, dorsal view.